Bake oven



R. P. BOLLING.

4 BAKE OVEN- APPLICATION FILED JUNE 8. I921.

Patented 0st. 31, 1922.

4 SHEETS-SHEET].

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INVENTOR.

ATTORNEY.

R. P.'BOLL|NG.

BAKE OVEN. APPLICATION FILED Jun; 8. I92I.

Patentd Oct. 31, 1922.

4 SHEETS-SHEET 2.

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A TTORNEY.

B. P. BQLLING. BAKE OVEN- APPLICATION FILED JUNE 8. I921- Patented Oct. 31, 1922.

4 SHEETS-SHEET 3.

INVEN TOR.

ATTORNEY.

R. P. BOLLING.

BAKEEOVEN. APPLICATION man JUNE 8 Patented Oct. 31, 1922.

4- SHEETS-SHEET 4.

INV EN TOR.

A TTORNEY.

Patented Get. El, 1922.

nnran stares PATEWTQf ROBERT PHILIP BOLLING, OF DETROIT, MICHIGAN.

BAKE OVEN.

Application filed June 8, 1921. Serialhlo. 475,894.

To all whom it maylcoacera: I

Bejit known that T, Ronnnr P. BoLLINe, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Bake Ovens, of which the following is a specification. [This invention relates to bake ovens and has for its object a bake oven provided with a rotatable vertical spindle that carries a plurality of sectional shelves upon which the articles to be baked are supported. Thls spindle may be rotated either by power or by hand, as best meets the requirements.

It is the object of the oven'to get uniforinity in the bakingand this is accom plished by both the rotation of the shelves and the arrangement for the travel of the heated air, first radially outward fron the center of the shelf and then radially inward to the center of the next shelf above, and so on. e

Inthe drawings,-

Fig, lis a front elevation of the oven.

' Fig. 2 is a vertical cross section of the same taken on the line 22 of Fig. 6.

Fig. 8 is a top plan view of the oven partly broken away.

Fig. 4 is a horizontal cross section showing the shelf spiders reversed and tiles used as the floor of the shelf. e e Fig. 5 is a section on the line 5-5 of Fig. 2 showing a gas burner used as a source.

of heat.

Fig. 6 isa section on the line 66 of Fig. 1.

of'sectional channel rings, the upper one g and bolted to the outside shell f. two shells are separated and braced by the Z bars 0. Of course it is not absolutely esdesignated a and the bottom one 7).

other and are spot-welded to the inside shell These sential that these uprights beZ bars, it be ing sufficient that the baruseid has a spacing web'and a flange on each side of the web.

The fianges serve the purpose of providing surfaces to which the outer and inner sheet metal shells may be riveted, as is plainly shown in 5, while the web portion assists in forming the spacing between'the outer and inner shellv Obviously when the 2 bars have been riveted to the outer and inner. shells they are held in vertical position. These channel rings and the Z bar These channel rings have the channels facing each "by the doori frame a.

braces form a strong steel skeleton work whichprevents the outer and inner shells becoming distorted when the space between them is packed. The upper channel ring is provided with large segmental slots 6 through which the space between the outer and inner shells f and g respectively may be packed with mineral wool 71. This constitutes an eiiicient heat-insulating medium. "The bottom plate 2' of a relatively heavy metal is secured to the lower channel ring 5 by screws. The center of this plate is apertured at and there is secured by screws to the bottom plate around this aperture a platek carrying the ball thrust bearing Z on which rides the collar m of the vertical shaft a." This vertical shaft is supported at its top ina bearing 0 upon WlllCll rests "thefcollar 79 attached to the top of the shaft.

This bearing '0 "is riveted or otherwise securedto the top plate The top plate is removably secured to the top channel ring byscrews.

This vertical shaft. plays quite an important part in my oven construction. It serves not only as a support for a plurality of shelves but it also serves to drive those shelves in rotation either by hand actuation vor, mechanical power actuation. It

is provided at itsend with a worm gear 7 that meshes wlth a worm s on the horlzontal cross shaft t that is supported iii the pillow block bearingsu secured to the top plate 9 of theoven.

Both the outer and the inner shells are recessed in front and provided with an ex- The bake oven is provided with a pair to be turned to engage with the inclined brackets 52 for the purpose of drawing the door tightly closed.

Through these doors may be inserted or removed at any time the spider sections 0. Each shelf is made up of pair of spider sections or castings provided at the center i with a half hub, Thesetwo half hub portions may be bolted together through the bolts and nuts 5. When these are tightly turned down they securely clamp the spider sections together so that these sections may be securely supported upon the vertical shaft a and turn with this shaft. Spacing sleeves 2O engage about the shaft n and space the shelves. It will readily be seen that a shelf section may be easily removed at any time for cleaning or repair. The specific construction of these shelf sections is one of the features of this oven. The spider sections, when assembled together, form four major spider openings 6 and four minor spider openings 7 (Fig. 4:). These spider openings 6 are surrounded by what amounts to an angle iron rim. Each opening 6 may be fitted with a tile 21,as shown in Fig. 4, for the purpose of providing a heat-holding shelving material for them-- tlcles to be baked, thereby increasing the efficiency of the oven.

The circulation of heated air and products of combustion is one of the features. The spiders are provided with ports 7 (Fig. 4:). These ports are alternately plugged and open (see plugs 22, Fig. 2). This causes the heated air and products of combustion to first travel radially from the center ports over the articles being baked and then draw in toward the center over the articles being baked upon the next shelf above.

The first shelf from the bottom isnot intended for articles but solely as a shield against the direct heat of the fire. The shelf 9 below the burner 8 is a shield for the lower thrust bearing Z against the direct heat of the fire.

This lapping of the heated air and products of combustion back and forth over the articles being baked while they, are slowly rotated secures a uniform baking and browning of the exterior, which comes. as close to an ideal condition as I believe that it is possible to attain.

Furthermore, the rotating shelves have all the advantages ordinarily inhering in this type of construction, to-wit, ease of charging. The landings 25 are bolted to the side channels 26 of the mouth of the oven. They are constructed of sheet metal packed with mineral wool and extend in. under the rotating shelves. With these landings extending under the shelves closely, as shown in Fig. 2, the heated air will not come out at the mouth of the oven, as it would otherwise, and annoy the attendant. Further, with the angle brackets 27 on the frame a: at the mouth of the oven the doors can. be held in horizontal position so pans can be slipped in over door landing and ontoshelf with a minimum of effort.

In place of the fire tile 21 shown in. Fig. 4. the spiders can be inverted as shown in the other figures and the shelf plates 28 secured to the spiders by screws 29..

As already indicated, the use of a simple worm shaft in the top of the oven at one end may be adapted for a hand drive through the sprocket wheel 10, chain 11, driving sprocket 12, and crank handle 13.

The other end of the cross shaft 6 may be adapted for a mechanieal power drive through the sprocket let and the chain 15.

The oven may be. provided with several of the usual adjuncts of an oven, namely,

the burner port that is covered by a cover 16, a thermometer 17 and a flue 18 with the dam 361 stem 19.

W at I claim is:

1, In a rotary oven, the combination of a pair of channelrings one at the bottom and one at the top, the latter provided with se Inentalslots, a plurality of flanged upright bars connecting the channel rings, and an outer and, inner shell secured to the flanges of the upright bars and the channel rings and a packing material rammed down between the shells through the openings provided in the top channel ring.

2. In a rotary oven, the combination of a wall enclosure, a vertical shaft supported to rotate therein, and sectional shelves removably clamped to the said vertical shaft.

3. In a rotary oven, the combination of a wall enclosure, a rotary shaft supported to rotate therein, and one. or more shelves supported on the shaft and including each a pair of spider sections clamped together and onto the shaft.

1. In a rotary bake oven, the combination of a wall enclosure, a shaft supported to rotate therein, and one or more shelves supported upon the said shaft and including each a pair of spider sections provided, with integral hub sections, and means for clamping the hub sections together to clamp the shelf sections. to each other and the shelf to the rotary shaft.

5. In a rotary oven, the combination of a ings tobe filled with the material that forms the supporting surface of the shelf, and minor spider openings alternately open and plugged in succeeding. sections to make the heated gases travel alternately inwardly and outwardly in succeeding shelves.

7. In a rotary oven, the combination of a wall enclosure and a rotary shaft provided with a plurality of shelves, the shelves and enclosure being arranged so that the heated air alternately travels from center of shaft outward and fromoutside of shelf inward on alternate shelves.

enclosure provided With a mouth, a shaft 10 supported by the enclosure a plurality of shelves supported upon the shaft, means for rotating the same, and landings constructed of sheet metal packed with insulating material and having portions extending closely 15 in under the rotating shelves.

In testimony whereof I affix my s1 ature.

ROBERT PHILIP BOLLING. 

